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  • Question
  • The transfer function for a PID controller is (where, ? i is the integral (reset) time and ?D is the derivative time.)


  • Options
  • A. Kc(1 + ?is + ?D ). s
  • B. The transfer function for a PID controller is (where, ? i is the integral (reset) time and ?D is the
  • C. The transfer function for a PID controller is (where, ? i is the integral (reset) time and ?D is the
  • D. The transfer function for a PID controller is (where, ? i is the integral (reset) time and ?D is the

  • Correct Answer
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  • Process Control and Instrumentation problems


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    • 1. Smoke density of the flue gas going out of the chimney is measured by a

    • Options
    • A. polarograph
    • B. thermal conductivity meter
    • C. photo electric cell
    • D. chromatograph
    • Discuss
    • 2. Which of the following measurements can be made by the measurement of emf?

    • Options
    • A. pH value
    • B. Degree of hydrolysis
    • C. Composition of complex ions
    • D. All (a), (b) & (c)
    • Discuss
    • 3. A negative gain margin expressed in decibels means a/an __________ system.

    • Options
    • A. stable
    • B. unstable
    • C. critically damped
    • D. none of these
    • Discuss
    • 4. A proportional controller with a gain of Kc is used to control a first order process. The offset will increase, if

    • Options
    • A. Kc is reduced.
    • B. Kc is increased.
    • C. integral control action is introduced.
    • D. derivative control action is introduced.
    • Discuss
    • 5. Instrumentation in a plant offers the advantage of

    • Options
    • A. greater safety of operation
    • B. better quality of product
    • C. greater operation economy
    • D. all (a), (b) and (c)
    • Discuss
    • 6. The __________ of a vapor pressure thermometer is a secondary element.

    • Options
    • A. pointer
    • B. Bourdon tube
    • C. bulb
    • D. none ofthese
    • Discuss
    • 7. Pick out the wrong statement.

    • Options
    • A. O2, NO and NO2 exhibit paramagnetic properties as a result of unpaired electrons.
    • B. CO2 is the strongest paramagnetic gas.
    • C. Paramagnetic susceptibility of gases decreases with temperature.
    • D. Paramagnetic susceptibility of gases permits the measurement of their concentration.
    • Discuss
    • 8. The closed loop pole of a stable second order system could be

    • Options
    • A. both real and positive.
    • B. complex conjugate with positive real parts.
    • C. both real and negative.
    • D. one real positive and the other real negative.
    • Discuss
    • 9. Working principle of radiation pyrometer is based on the

    • Options
    • A. Wien's law
    • B. Kirchoffs law
    • C. Stafan-Boltzman law
    • D. Seebeck effect
    • Discuss
    • 10. A magnetic flowmeter is

    • Options
    • A. based on the principle of Faraday's law.
    • B. capable of measuring the flow rate of slurries and electrolytes.
    • C. based on the linear relationship between the fluid flow rate and the induced voltage.
    • D. all (a), (b) and (c).
    • Discuss


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